Search Publications
Discovery of Rotational Modulations in the Planetary-mass Companion 2M1207b: Intermediate Rotation Period and Heterogeneous Clouds in a Low Gravity Atmosphere
Showman, Adam P.; Apai, Dániel; Marley, Mark S. +2 more
Rotational modulations of brown dwarfs have recently provided powerful constraints on the properties of ultra-cool atmospheres, including longitudinal and vertical cloud structures and cloud evolution. Furthermore, periodic light curves directly probe the rotational periods of ultra-cool objects. We present here, for the first time, time-resolved …
Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images: The southern hemisphere
Jorda, L.; Lamy, P. L.; Lara, L. M. +49 more
Aims: The OSIRIS camera on board the Rosetta spacecraft has been acquiring images of the comet 67P/Churyumov-Gerasimenko (67P)'s nucleus since August 2014. Starting in May 2015, the southern hemisphere gradually became illuminated and was imaged for the first time. Here we present the regional morphology of the southern hemisphere, which serv…
IC 751: A New Changing Look AGN Discovered by NuSTAR
Harrison, F. A.; Boggs, S.; Stern, D. +12 more
We present results of five Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the type 2 active galactic nucleus (AGN) in IC 751, three of which were performed simultaneously with XMM-Newton or Swift/X-Ray Telescope. We find that the nuclear X-ray source underwent a clear transition from a Compton-thick ({N}{{H}}≃ 2× {10}
Evolution of CO2, CH4, and OCS abundances relative to H2O in the coma of comet 67P around perihelion from Rosetta/VIRTIS-H observations
Kührt, E.; Encrenaz, T.; Erard, S. +19 more
Infrared observations of the coma of 67P/Churyumov-Gerasimenko were carried out from 2015 July to September, I.e. around perihelion (2015 August 13), with the high-resolution channel of the Visible and Infrared Thermal Imaging Spectrometer instrument onboard Rosetta. We present the analysis of fluorescence emission lines of H2O, CO…
Electrostatic solitary waves and electrostatic waves at the magnetopause
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +1 more
Electrostatic solitary waves (ESWs) are characterized by localized bipolar electric fields parallel to the magnetic field and are frequently observed in space plasmas. In this paper a study of ESWs and field-aligned electrostatic waves, which do not exhibit localized bipolar fields, near the magnetopause is presented using the Cluster spacecraft. …
Physical conditions in the central molecular zone inferred by H3+
Le Petit, Franck; Ruaud, Maxime; Bron, Emeric +4 more
Context. The H3+ molecule has been detected in many lines of sight within the central molecular zone (CMZ) with exceptionally large column densities and unusual excitation properties compared to diffuse local clouds. The detection of the (3, 3) metastable level has been suggested to be the signature of warm and diffuse gas in…
MUSE crowded field 3D spectroscopy of over 12 000 stars in the globular cluster NGC 6397. II. Probing the internal dynamics and the presence of a central black hole
Dreizler, S.; Brinchmann, J.; Roth, M. M. +8 more
We present a detailed analysis of the kinematics of the Galactic globular cluster
Hubble Tarantula Treasury Project. III. Photometric Catalog and Resulting Constraints on the Progression of Star Formation in the 30 Doradus Region
Panagia, N.; Anderson, J.; Zaritsky, D. +21 more
We present and describe the astro-photometric catalog of more than 800,000 sources found in the Hubble Tarantula Treasury Project (HTTP). HTTP is a Hubble Space Telescope Treasury program designed to image the entire 30 Doradus region down to the sub-solar (∼0.5 M⊙) mass regime using the Wide Field Camera 3 and the Advanced Camera for S…
Non-LTE Inversions of the Mg II h & k and UV Triplet Lines
Leenaarts, Jorrit; Asensio Ramos, Andrés; de la Cruz Rodríguez, Jaime
The Mg II h & k lines are powerful diagnostics for studying the solar chromosphere. They have become particularly popular with the launch of the Interface Region Imaging Spectrograph (IRIS) satellite, and a number of studies that include these lines have lead to great progress in understanding chromospheric heating, in many cases thanks to the…
The Musca cloud: A 6 pc-long velocity-coherent, sonic filament
Alves, J.; Beuther, H.; Tafalla, M. +2 more
Filaments play a central role in the molecular clouds' evolution, but their internal dynamical properties remain poorly characterized. To further explore the physical state of these structures, we have investigated the kinematic properties of the Musca cloud. We have sampled the main axis of this filamentary cloud in 13CO and C18